ASTM B596 Au-Cu vs. 85-platinum 15-iridium
Both ASTM B596 Au-Cu and 85-platinum 15-iridium are otherwise unclassified metals.
For each property being compared, the top bar is ASTM B596 Au-Cu and the bottom bar is 85-platinum 15-iridium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 220 |
| Elongation at Break, % | 4.3 to 17 | |
| 5.5 to 34 |
| Poisson's Ratio | 0.41 | |
| 0.38 |
| Shear Modulus, GPa | 36 | |
| 81 |
| Shear Strength, MPa | 280 to 360 | |
| 370 to 420 |
| Tensile Strength: Ultimate (UTS), MPa | 450 to 620 | |
| 560 to 730 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 110 |
| Melting Completion (Liquidus), °C | 1060 | |
| 1820 |
| Melting Onset (Solidus), °C | 930 | |
| 1790 |
| Specific Heat Capacity, J/kg-K | 150 | |
| 130 |
| Thermal Expansion, µm/m-K | 14 | |
| 8.4 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 6.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 6.7 | |
| 2.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 18 | |
| 22 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.1 | |
| 5.7 |
| Stiffness to Weight: Bending, points | 8.5 | |
| 9.3 |
| Strength to Weight: Axial, points | 6.8 to 9.4 | |
| 7.1 to 9.3 |
| Strength to Weight: Bending, points | 7.1 to 8.8 | |
| 6.9 to 8.3 |
| Thermal Shock Resistance, points | 22 to 30 | |
| 21 to 28 |
Alloy Composition
| Copper (Cu), % | 9.0 to 11 | |
| 0 |
| Gold (Au), % | 89 to 91 | |
| 0 |
| Iridium (Ir), % | 0 | |
| 14.5 to 15.5 |
| Platinum (Pt), % | 0 | |
| 84.3 to 85.5 |
| Residuals, % | 0 | |
| 0 to 0.2 |